WATCH: Christian in Iraq Talks About Persecution From Terrorist Group ISIS

As the terrorist group ISIS continues its brutal takeover of Iraq, Christians have been given an ultimatum: convert to Islam or be killed.

Iraqi Christians are begging for help from the civilized world after Mosul, the northern city where they have lived and worshiped for 2,000 years, was purged of non-Muslims by ISIS, the jihadist terror group that claims to have established its own nation in the region.

"By 12 noon on Saturday, the Christians -- all of them -- left the city," Yousif Habash, an Iraqi-born bishop of the Syriac Catholic Church, told FoxNews.com.

Mosul, Iraq's second-largest city, included 60,000 Christians in 2003. By last month, the number had dwindled to just 35,000. It now stands at zero, according to Ignatius Yousef Younan III, patriarch of the Syrian Catholic Church.

Thousands of Christians have fleed and the situation is being described as a genocide and ethnic cleansing.

Last night Fox News' Sean Hannity interviewed Christian Kaldo Oganna, who is living in Iraq.

"Our people are under the threat of killing, ethnic cleansing," he said. "We are all in fear. The Jihadis are going to attack."

Oganna begged for condemnation of the violence and begged the United States to stop ISIS before things get worse. The entire interview is worth your time.